RADIATION THERAPY COMPREHENSIVE EXAM 2026/2027
QUESTIONS AND SOLUTIONS RATED A+
✔✔#63 The pea shaped blocks in the DRR on the back of this card are placed to
protect the:
A. Liver
B. Small bowel
C. Colon flexures
D. Kidneys - ✔✔
✔✔The answer to #63 is:
D. Kidneys - ✔✔The answer to #63 is:
D. Kidneys
✔✔#65 According to the dose volume histogram on the back of this card, the whole
heart receives:
A. 0 cGy
B. 250 cGy
C. 1000 cGy
D. 1400 cGy - ✔✔
✔✔The answer to #67 is:
A. 0 cGy - ✔✔The answer to #65 is:
A. 0 cGy
✔✔#65 According to the dose volume histogram on the back of this card, 50% of the
GTV receives:
A. 4000 cGy
B. 4100 cGy
C. 4250 cGy
D. 4500 cGy - ✔✔
✔✔The answer to #67 is:
B. 4100 cGy - ✔✔The answer to #65 is:
B. 4100 cGy
,✔✔#69 According to the treatment plan isodose on the back of this card, which field
requires a wedge:
A. Right lateral
B. Left lateral
C. Anterior
D. Posterior - ✔✔
✔✔The answer to #69 is:
C. Anterior - ✔✔The answer to #67 is:
C. Anterior
✔✔#71 The isodose distribution shown on the back of this card is for what beam
arrangement?
A. 270 degree arc
B. 360 degree arc
C. 3 field
D. 4 field box - ✔✔
✔✔The answer to #71 is:
B. 360 degree arc
The isodose distribution shown in a circular pattern represents a 360 degree arc. -
✔✔The answer to #71 is:
B. 360 degree arc
✔✔A good surface landmark for the true vocal cords is the:
A. Cricoid cartilage
B. Suprasternal notch
C. Thyroid cartilage
D. Hyoid bone - ✔✔C. Thyroid cartilage
✔✔The space in front of the epiglottis is called the:
A. Supraglottis
B. Vallecula
C. Uvula
D. Pyriform sinus - ✔✔B. Vallecula
, ✔✔The clavicle and the 1st rib articulate with the:
A. Manubrium
B. Body of the sternum
C. Xiphoid process
D. T1 - ✔✔A. Manubrium
✔✔The physicist has completed monthly calibrations and discovers that the dose rate
has been 248 MU/min instead of the intended 250 MU/min for the last month. This
means that all patients within that time have received:
A. 2 more monitor units than calculated
B. 2 less monitor units than calculated
C. The intended dose over a longer period of time
D. The intended dose over a shorter period of time - ✔✔C. The intended dose over a
longer period of time
The discrepancy in dose rates had only affected the treatment time. The dose rate was
slower than intended.
✔✔The maximum allowable transmission though the MLC's is:
A. 1%
B. 5%
C. 10%
D. 15% - ✔✔B. 5%
✔✔For portal verification, bone tissue contrast is better using KV imagers rather than
MV imagers due to the absence of:
A. Screens in the MV beam
B. Screens in the KV beam
C. Photoelectric interactions in the MV beam
D. Vacuum tube in the KV beam - ✔✔C. Photoelectric interactions in the MV beam
✔✔The purpose of the room lasers is to aid in patient positioning and to indicate:
A. Isocenter of the machine
B. Rotational axis of the gantry
C. Rotational axis of the collimator
D. All of the above - ✔✔D. All of the above
QUESTIONS AND SOLUTIONS RATED A+
✔✔#63 The pea shaped blocks in the DRR on the back of this card are placed to
protect the:
A. Liver
B. Small bowel
C. Colon flexures
D. Kidneys - ✔✔
✔✔The answer to #63 is:
D. Kidneys - ✔✔The answer to #63 is:
D. Kidneys
✔✔#65 According to the dose volume histogram on the back of this card, the whole
heart receives:
A. 0 cGy
B. 250 cGy
C. 1000 cGy
D. 1400 cGy - ✔✔
✔✔The answer to #67 is:
A. 0 cGy - ✔✔The answer to #65 is:
A. 0 cGy
✔✔#65 According to the dose volume histogram on the back of this card, 50% of the
GTV receives:
A. 4000 cGy
B. 4100 cGy
C. 4250 cGy
D. 4500 cGy - ✔✔
✔✔The answer to #67 is:
B. 4100 cGy - ✔✔The answer to #65 is:
B. 4100 cGy
,✔✔#69 According to the treatment plan isodose on the back of this card, which field
requires a wedge:
A. Right lateral
B. Left lateral
C. Anterior
D. Posterior - ✔✔
✔✔The answer to #69 is:
C. Anterior - ✔✔The answer to #67 is:
C. Anterior
✔✔#71 The isodose distribution shown on the back of this card is for what beam
arrangement?
A. 270 degree arc
B. 360 degree arc
C. 3 field
D. 4 field box - ✔✔
✔✔The answer to #71 is:
B. 360 degree arc
The isodose distribution shown in a circular pattern represents a 360 degree arc. -
✔✔The answer to #71 is:
B. 360 degree arc
✔✔A good surface landmark for the true vocal cords is the:
A. Cricoid cartilage
B. Suprasternal notch
C. Thyroid cartilage
D. Hyoid bone - ✔✔C. Thyroid cartilage
✔✔The space in front of the epiglottis is called the:
A. Supraglottis
B. Vallecula
C. Uvula
D. Pyriform sinus - ✔✔B. Vallecula
, ✔✔The clavicle and the 1st rib articulate with the:
A. Manubrium
B. Body of the sternum
C. Xiphoid process
D. T1 - ✔✔A. Manubrium
✔✔The physicist has completed monthly calibrations and discovers that the dose rate
has been 248 MU/min instead of the intended 250 MU/min for the last month. This
means that all patients within that time have received:
A. 2 more monitor units than calculated
B. 2 less monitor units than calculated
C. The intended dose over a longer period of time
D. The intended dose over a shorter period of time - ✔✔C. The intended dose over a
longer period of time
The discrepancy in dose rates had only affected the treatment time. The dose rate was
slower than intended.
✔✔The maximum allowable transmission though the MLC's is:
A. 1%
B. 5%
C. 10%
D. 15% - ✔✔B. 5%
✔✔For portal verification, bone tissue contrast is better using KV imagers rather than
MV imagers due to the absence of:
A. Screens in the MV beam
B. Screens in the KV beam
C. Photoelectric interactions in the MV beam
D. Vacuum tube in the KV beam - ✔✔C. Photoelectric interactions in the MV beam
✔✔The purpose of the room lasers is to aid in patient positioning and to indicate:
A. Isocenter of the machine
B. Rotational axis of the gantry
C. Rotational axis of the collimator
D. All of the above - ✔✔D. All of the above
